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Historically we have avoided the lower range engines in the BMW in favour of the 6 cylinder ones. Looking at the F30/31 they have moved more to 4 cylinder engines which seem to be the same but with lower engines detuned. I have heard good reviews about the 320d engine, but is the 318D engine just as good just with reduced power?

Hi there, a lot of manufacturers have made a change to smaller engines and added a turbo to give large engine power while benefitting from small engine fuel economy.
It does look like the engines are physically identical, with the 318d being a slightly de tuned version. If you like power, you may still prefer the 320d over 318d.